Twist-drill-milling machine



- (No Model.)

M. G. JOHNSON.

TWIST DRILL MILLING MACHINE Patented June 25, 1895.

5 Sheets-Sheet 1.

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(No Model.) 5 sheets -sheet 2.

M. 0. JOHNSON.

TWIST DRILL MILLING MACHINE. No.541,550. Patented June 25, 1895.

w J 62 5 4i (No Model.) 5 5 SheetsSheet s.

v M. G. JOHNSON.

TWIST DRILL MILLING MAQHINB. No. 541,550. Patented June 25, 1895.

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TWIST DRILL MILLING MACHINE. No. 541,550. Patented June 25, 1895.

5 Sheets-Sheet '5'.

Patented June 25, 1-895.

.1... l J l-ll m I (No Model.)

M. C. JOHNSON. TWIST DRILL MILLING MAGHINE.

, UNITED STATES PATENT OFF CE.

MOSES C. JOHNSON, OF HARTFORD, ASSIGNOR TO THE T. & B. TOOL COMPANY,

' DANBURY, CONNECTICUT.

TWlST-DRlLL-MILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 541,550, dated June 25, 1895.

- Application filed May 7,1394. Serial No. 510,327. (No model.)

To all whom it may concern: I Be it known that I, MOSES O. JOHNSON, of Hartford, in the county of Hartford and State of Connecticut, have invented certain new 5 and useful Improvements in Twist-Drill-Milling Machines, of which the following, is a full, clear, and exact description,,whereby any one skilled in the art can make and use the same. The object of my invention is to provide a machine by means of which an improved twist drill may be manufactured, the machine combining means for producing a twist drill with a groove of any desired pitch and depthand consequent thickness of the web. 15 To this end my invention consists in the details of the several parts making up the machine as a whole and in the combination of such parts as more particularly hereinafter described and pointed out in the claims.

Referring to the drawings, Figure 1 is a plan view of my improved milling-machine. Fig. 2 is a rear view of the same with the pulley and cone shafts cut in section immediatelyloack of their rear bearings. Fig. 3 is a 25 view in side elevation looking from the right of Fig. 1, with change-gear yoke removed and gears indicated by dotted outline. Fig. 4 is a view in side elevation looking from the left of Fig. 1. Fig. 5 is a view in front elevation of the machine. Fig. 6 is a view in vertical section of the machine on a plane lengthwise of and through the axes of the drill-spindle and feed-shaft. Fig. 7 is a detail top or 'plan view of a part of the table and of the drill- 5 slide saddle and part of its operating mechanism, with part broken away. Fig. 8, Sheet 2, is a detail top view of the drill-guide slide and bottom view of the drill-guidebase, the faces shown being adapted to engage each other, scale enlarged. Fig. 9 is a detail top or plan view, with parts broken away, showing a portion of the top of the table, the drill-slide saddle, the cutter-head slides, and the head taper slide and their methodof en- 5 gagement. Fig. 10 is adetail view of the cutter-head-slide knee, the cutter-head slides, and in section of the head taper slide out through the groove in the latter and looking toward the cutter-head slides, on enlarged scale. Fig. 11 is a detail edge view of the head taper slide, showing its engagement with the ing A cutter-head slides, scale enlarged. 'Fig. 12 is a detail edge view of the head taper slide looking from the cutter-head slides, scale enlarged. Fig. 13 is a detail view, in crosswise section, through the drill-guide box and the drill-guide mechanism borne therein, scale enlarged. Fig. 14 isadetail view, in lengthwise section, through the same, scale enlarged. Fig. 15 is a detail view, on enlarged scale, in central vertical section, through the drill-holding spindle. Fig. 16 is a detail view, on enlarged scale, of the feed trip device, with parts broken away to show construction. Fig. 17 is a detail view, in lengthwise section, through the spring-case appurtenant to the clutch mechanism for controlling the movement of the saddle-swinging'devices." Fig. 18 is a detail view, in lengthwise section, through the forward end of the chuck-body, showing the jaws and the manner in which they are attached to the spindle and plunger, said View being taken on a different plane from the plane of section of Fig. 14. Fig. 19 is a detail view, in cross-section, through the chuck-jaws on a plane passing through the enlarged end.

In the accompanying drawings the letter A denotes a table or support on which the ma-. chine as a whole is mounted. An openingA is made through this table 'near the front and at one side thereof, the hub B of the drill slide saddle B resting on the table, adjacent to this hole .A. A hole is made centrally through thishublB' into which is inserted,

as shown, the saddle pivot b, the lower end of which is threaded and bears a washer and nut b, b that hold the pivot securely in place on the table. 'A saddle worm segment A is secured to one side of the table, the segment projecting upward and outward therefrom. To the rear side of the table are secured the cone shaft hearing A and pulley shaft bear- Each of these bearings is of considerable width and in the hearing A is borne the cone shaft a to which is secured the small 5 feed cone pulley a, a sleeve a integral with the small feed cone pulley at" extending through the bearing A and having secured thereto the collar a to prevent the pulley from moving endwise. The cone shaft a has Ico alengthwise groove (1 in which is borne a spline engaging with the small feed cone pulley at, this construction allowing the feed cone shaft a free lengthwise movement within the pulley, but compelling the rotation of the shaft and pulley together. The pulley is held against lengthwise movement. l/Vithin the hearing A is supported the pulley shaft a to which are secured the large cone pulley a and the driving pulley a The driving pulley or may be rotated from any source of power and the rotation of the pulley shaft is communicated to the small feed cone shaft by means of the belt a Cutter-Spindle Driving llfechanism.

The cutter head slide knee 0 is secured to the table A as by means of bolts or screws passing through flanges at the bottom, the central portion of this knee being hollowed out, as shown in Fig. 9, for purposes of lightness. dovetail projection G and borne on this dovetail projection is the intermediate slide 0 havinga dovetail groove fitting the projection C on one side and on the opposite side a dovetail groove fitting the dovetail projection on the cutter head slide 0'. The cutter head 0 is adjustably secured to the cutter head slide 0 by means of bolts passing through slots in the former. The cutter head slide 0' is adjustable vertically upon the intermediate slide by means of an intermeshingfeed screw 0 on the one part engaging a threaded nut on the opposite part, the outer end of this feed screw being of an angular shape to receive a wrench or a handle as a means of turning it. The cutter head 0 is adjustable horizontally on the cutter head slide 0 by means of a feed screw 0 on the one part fitting a threaded nut on the opposite part and this feed screw may be provided with a handle 0 as a means of turning the latter, the bolts passing through the slots in the cutter head and into the cutter head slide clamping the former in place when the desired adjustment has been attained.

Projections c are formed on the cutter head and in these projections bearings for the cutter spindle d are formed, this cutter spindle being mounted in the hearings in any manner desired and bearing on its inner end a cutter suitably secured thereto.

To the other end of the spindle is secured one end of a universal ball joint (1, the opposite end of this joint being secured to the joint shaft socket d and splined within this socket and rotating therewith, but having a free longitudinal movement therein, is the joint shaft (1 to the opposite end of which is secured one end ofanother universal ball joint similar to the one just described, the opposite endof this ball joint being secured to the pulley shaft a by means of which, through the above described mechanism, rotary movement is imparted to the cutter borne on the cutter spindle (Z. By means of this mechanism a vertical movement of the cutter spindle through the medium of the slides may be had On one side of the knee is formed a' and the slides may be adjusted as desired one upon the other, the-universal ball joints, and the longitudinal movement of one portion of the shaft within another permitting any desired degree of this adjustment.

DM Zl-BZank-Feeding .Mechanism.

worm shaft 6 is mounted in hearings in the feed swivel box e that is pivoted at one end to a downward projection near one end of the drill slide saddle B and preferably inte gral therewith. In the opposite end of this downward projection a slot 11 is formed through which a bolt 6 from the feed swivel box extends, this bolt and slot allowing the feed swivel box to have a vertical movement.

The feed worm e is in mesh with a feed worm gear fsecured to one end of and preferably integral with the feed screw f. This feed screw is secured to the feed shaft f one end of which has a bearing in a downward projection 17 from the under side of the saddle B, a nut fitting a threaded portion on the feed shaft and resting against one end of the feed screw and holding it against lengthwise movement toward the projection 11 A flanged sleeve f is borne on the feed shaft f one end resting against the feed worm gearfand preventing endwise movement in this direction,

the inner end of this flanged sleeve being borne in the body of the drill slide saddle B. A change gear yoke to be hereinafter described is pivoted on the flanged part f" of this sleeve, and secured to the feed shaft and resting against the flange and change gear yoke is a gear f Mounted on the feed shaft outside of this gearf is a sleeve f and also mounted on the shaft and resting against this sleeve is a handle f that is held in place by means of the nut f secured to the outer threaded end of the feed shaft.

Upward projecting flanges b preferably integral with the body of the drill slide saddle are formed on each side of the latter, the space between these flanges affordinga slide way for the drill slide which is borne therein, and on these flanges b are secured the drill slide straps Z1 the straps extending beyond the edge of the flanges and over projecting feet D on the drill slide D, the latter being held against removal by means of the mechanism described. On the under side of the drill slide D and in mesh with the feed screwf is secured a feed screw nut D. The mechanism above described provides for the feeding movement of the drill slide saddle, and a drill blank borne thereon lengthwise of the cutter, the forward movement of this drill slide being given by the mechanism described, the

handle f being used for a quick return of theslide. v

Saddle-Swinging lllecham'sm.

A change gear yoke g is pivoted on the flanged part) of the sleeve f one end of the yoke containing a slot g through which passes a bolt 9 fitting a screw threaded opening in the lateral projection 9 near one end of the drill slide saddle B. The opposite end of this change gear yoke has a lengthwise slot g within which is adj ustabl y secured the change gear stud bearing a double change gear g. This double change gear. consists ofa small gear in mesh with the gear f secured to the feed shaft f? and a larger gear in mesh with the pinion h secured to the bevel gear shaft h. The stud g is made adjustable in the yoke g for the purpose of allowing diiferent sizes of gears to be interposed between the feed shaft f and the pinion h for varying the speed of parts of the mechanism.

The bevel gear shaft h is mounted at each end in bearings B secured to the drill slide saddle B and centrally in the bearing D secured to the drill slide D. A lengthwise groove h is formed in the bevel gear shaft h and to this shaft near one end is secured the shaft clutch it having an annular groove 7L and projections 71 Pivoted on the stud i secured to the drill guide box to be hereinafter described is an shaft 72 and has a limited longitudinal movement thereon. The worm h is secured to the outer end of the bevel gear shaft h, a sleeve on this worm extending through the bearing B and projecting beyond the opposite edge of the said bearing, and to this end of the sleeve is secured the shaft clutch disk h having projections 7L adapted to engage the projections 71 on the shaft clutch If. This construction enables the worm gear h to be thrown into or out of engagementwith the bevel gear shaft h by the movement of the shaft clutch yoke 71.

The saddle wormh is mounted in the bearings B located in downward projections from the under side of the drill slide saddle B and toone end of this worm and in mesh with the worm h is a worm gear h through the medium of which rotary movement is communicated from the bevel gear shaft to the worm h This worm k is in mesh with the saddle worm segment A secured to the table. By the rotation of the worm it through the medium of the bevel gear shaft h a swinging movement is imparted to the drill slide saddle B on the pivot b. It is to be noted that the center of this pivot is located directly under and iii line with the diameter of the cutter secured to the cutter spindled.

A spring casej is secured to the bevel gear shaft h, as by means of the screw j a shoulder being formed within this case and one end of a spiral springj rests on this shoulder, the opposite end of said spring thrusting against the plunger j that in turn thrusts against the shaft clutch h tending to normally keep these clutch parts in engagement. 1

A knockoff rod is supported at one end in the bearing D and at its opposite end in the drill guide box and to this rod is secured the clutch knock-off k by means of a binding screw 70 This knock-0E k has on its lower edge a projection 10 and a beveled under surface lc and to the projection is? is pivoted the knock-off latch k The upper ends of this knock-off latch are beveled in opposite directions lengthwise of the movement of the rod is on the drill slide carriage, and the upper end ofthis latch is so located as to come in contact with the under side of a pin 2' in the arm '6? of the shaft clutch yoke i, throwing the arm upward and consequently the clutch parts out of engagement. This mechanism provides an automatic device whereby the clutch parts are thrown out of engagement and the swinging movement of the carriage stopped, the clutch knock-off 70 being adjustably secured to the rod 7r so that this disengagement of the clutch parts is insured at any predetermined time.

DrilLBZank Holding and Rotating ltlechanism.

jecting on the oppositeside and on this end,

of the sleeve Z is secured, by means of engaging screw threaded parts, the nut Z this nut resting against a shoulder on the sleeve in such manner as to prevent any binding of the nut upon the bearing D The bevel gear Zis in meshwith a bevel gear Z secured to the twist worm Z This twist worm is borne in suitable bearings in the drill slide D and is in engagement with the worm gear Z loosely mounted on the drill spindle m.

The-drill spindle mis mounted in bearings D D, on the drill slideD. This spindle is tubular and located therein and extending m is secured on the screw threaded end of the drill spindle, the chuck plunger n extending into this chuck body m. This chuck body is also provided with radial slots on which register with the slots at in the plunger, the chuck jaws 01. extending through the walls of the chuck body to the outer surface thereof. The chuck cap m is secured to the threaded portion of the chuck body m, the inner surface of the outer end of the cap being beveled to fit the beveled edges of the chuck jaws. This construction gives to the chuck jaws a radial movement as the cap m is moved lengthwise on the chuck body or as the chuck plunger is moved longitudinally Within the spindle, the construction afiordin g means whereby a drill blank may be securely held between the jaws. A drill spindle clutch 0 is splined to the drill spindle m, has a limited sliding movement thereon, and rotates with it. An annular groove 0' is formed in the drill spindle clutch and in this groove and on diametrically opposite sides thereof rests the forked ends of the indexing handle 0 This handle is pivoted in the clutch yoke 0 that is clamped to the clutch yoke bushing m as by means of the screw 0 In a socket in this clutch yoke is mounted a plunger 0 that is normally thrust against the indexing handle by means of the spring 0 that is located in the chamber 0 with one end thrusting against the plug 0 and the other againstashoulder on the plunger. This plug 0 has a central hole therein through which projects one end of the plunger. Clutch pins Z are secured in the worm gear Z and are adapted to engage recesses 0 in the drill spindle clutch 0, these recesses 0 being located to correctly register with the pins, each of the pins engaging the recesses at the same time. In the opposite side of the drill spindle clutch 0 is located a pin 0 that is adapted to engage the recess 0 in the clutch yoke 0 The pins 0 and o are constructed of such a length that one will engage its recess at the same time or a little later than the time that the other. is leaving its recess. This construction enables the drill spindle to be thrown into or out of engagement at will with the worm gear Z The bushing m is mounted on the drill spindle m and is held against rotation by means of the pins m and on this bushing is rotarily mounted the hand wheel 19 which is held in place by means of the nut 19' fitting the outer threaded end of the bushing. The

chuck hand wheel nut 19 is secured to the feed latch pin b Taper-Slide lllechanismj.

A socket d is formed in the drill slide D and is covered bya plate (Z that is secured as by means of screws to the upper surface of the drill slide. A taper slide stud cl is secured to the drill slide as by means of interengaging screw threaded parts, and rotarily mounted on the upper end of this stud is a stud bushing q that is angular in form in cross section and is located in the slot Q2 in the taper slide g. This taper slide q is located in the recess d in the drill slide and the construction just described enables the taper slide to have a sliding movement laterally of the drill slide and at the same time a rotary movement on the stud d. A groove (1 is located in the upper surface of this taper slide, the groove being deeper at the right hand end (Fig. 9) than at the left hand end, that is, it slants downward from the left to the right, as seen in said figure, and the upper surface of the projection q located between this groove and its nearest edge is parallel to the bottom of the groove, that is, it is also inclined from left to right. The edge of this taper slide q projects into a groove 0 formed in the projection c on the intermediate slide 0. A taper slide strap 0 is secured to the upper one of the projections 0 the lower edge of the strap projecting into the groove g This construction necessitates an upward movement of the intermediate slide 0 and consequently of the cutter spindle d and the cutter located thereon, as the drill slide is moved toward the right (Figs. 5, 6 and 9 of the drawings). This construction is for the purpose of thickeningthe web in the drill blank being milled as the groove cut therein approaches the shank, the taper slide strap 0 preventing any disengagement of the taper slide (1 from the intermediate slide 0.

Feed K'nock-Ofl Mechanism.

A feed latch pin b is secured to the upper edge of the feed swivel box e", a shoulder I) being formed on the side of this pin. A plunger case? is secured to the side of the drill slide saddle B and in this case is a plunger chamber r within which is located a spiral spring T The plunger r is also located in this chamber and one end of it has a shoulder 7" adapted to engage the shoulder b on the The spring 0" thrusts against the spring shoulder r on the plunger and tends to normally hold the plunger and latch pin in engagement. A feed knock oil arm 0* is secured to the outer end of the plunger r as by means of a out 0, this arm projecting above the edge of the plunger case. A feed knock off r is adjustably secured to the drill slide D by means of a headed stud r", the head of which tits in a longitudinal slot d extending lengthwise in the body of the drill slide D, a nut r being fitted on the outer screw threaded end of this stud to clamp the IIO feed knock off securely in position. This knock off is preferably keyed to the stud to prevent rotation. this feed knock off is in line with the feed knock off arm r and extends downward far Drill- Guide lllechanism.

A drill guide box 3 is secured to the top of the drill slide saddle B at the end adjacentto the cutter spindle d, the cutter being located on the cutter spindle in such position asto overlie this drill guide box, that is of pan shape and constructed to receive the oil and chips that accumulate in-the cutting of the drill blank, a suitable outlet being provided.

to carry off this accumulation. Secured within this drill guide box 3, as by means of screws 3 is a base 8' having a lengthwise groove therein. This base maybe made integral with the box if desired; and secured to the box and base is a drill guide holder 8 having a tongue 8 projecting within the groove in the base, thus preventing any sidewise movement of the two parts on each other, the screws 3 extending upward through the drill guide box into the drill guide holder 5 A screw threaded opening 8 extends lengthwise through the body of thedrill guide holder .9 and in it fits a screw threaded bolt t passing through a downward projecting part if from one end of the drill guide slide t. This bolt 25 is held against lengthwise movement but free to rotate within the projection t by means of a washer t secured to the bolt on the opposite side of the projection from the head thereof. This drill guide slide 15 is located in a groove 3 in the drill guide holder 3 and has a sliding movement longitudinally therein. In the upper surface of this drill guide slide are formed diagonal grooves 27*, the grooves extending from the outer edges of the slide at the end bearing the projection t to a point where they meet at the opposite end of the slide.

A drill guide base consisting of two members u and u rests upon the uppersurface of the drill guide holder and drill guide slide and on the under surface of each member of the drill guide base are tongues n n fitting the diagonal grooves 27 in the drillguide slide- 25. The drill guide straps t are secured, as by means of screws, to the upper side of the drill guide slide 15 near each end thereof, these drill guide straps having lips overhanging the feet to on each of the drill guide bases u and u, this construction allowing of asidewise movement of the drill guide bases 1/. and u but preventing any longitudinal move- The path of movement of with the diametrical axis of the cutter.

'ment. As the drill guide slide 75 is given a longitudinal movement by means of the bolt 1? the tongues on the under side of the drill guide bases lying in the diagonal'grooves t in the drill guide slide cause the drill guide bases to and it to move laterally. Drill guides 'v and v are secured to the upper surface of the drill guide bases u and u respectively as by means of pins 12 the drill guides moving laterally with, the bases. These drill guides are adapted to lie with their sides in proximity or against each other and in these adjacent surfaces and running lengthwise of the drill guide are grooves or channels forming a guide opening 22 into which a drill blank held within the drill spindle chuck 0 is adapted to project.

The operation of the machine briefly stated is as follows: A drill blank having been clamped in the drill holder by the mechanism described, and the shafts a and d being rotatedthe feed swivel box e is'raised bringing the worm e into engagement with the worm gear f. This action sets the whole mechanism in motion, the drill slide D being fed forward and the drill blank being moved along underneath the cutter that operates upon it to cut a groove. The blank is also projected into the drillguide described. The engagement of the taper slide q with the cutter head slides causes the cutter to be moved upward, this operation increasing the thickness 'of the web as'the drill blank isfed for-- ward. In this forward movement of the drill slide the spindleim is given a slow rotation which causes a spiral groove to be cut in the drill blank. At the same time that the drill of a uniform width from point to shank as the cutter is drawn away from the axis of the blank, this result being possible from the fact that the pivot b is located directly in line This causes the groovein. the drill blank to be cut with any proportion between its width at the point and at the shank as may be determined by the relation between the longitudinal and axial movements of the carriage, as the cutter is drawn away from the axis of the blank, this result being possible from the fact that thepivot b is located directly in line with the diametrical axis of the cutter.

I claim as my invention- 1. In combination in a machine for grooving drills, a frame or bed, a reciprocating drill blank holder mounted on a pivoted saddle, the saddle pivoted on the bed, means for imparting a lateral swinging movement to the drill holding spindle, means for reciprocating the holder, and a cutterhaving its diametrical axis in alignment with the saddle pivot, all substantiallyas described.

IIO

2. In combination in a machine for grooving drills, a frame or bed, a reciprocating drill blank holder mounted on a slide saddle, the Saddle pivoted on the bed, means for imparting a lateral swinging movement to the drill holding spind e, means for reciprocating the holder, a cutter having its diametrical axis in alignment with the saddle pivot, and means for varying the distance between the axis of the drill holder and the cutter, all substantially as described.

3. In combination in a machine for grooving drills, a frame or bed, a reciprocating drill slide supported on the swinging saddle, means for reciprocating the slide, the drill spindle borne on the drill slide, the saddle pivoted to the bed, means for imparting a sidewise swing ing movement to the saddle, the cutter having its diametrical axisin alignment with the saddle pivot, and means for moving the cutter away from the line of the axis of the drill spindle, all substantially as described.

l. In combination in a machine for grooving drills, a frame or bed, a cutter spindle borne on a movable slide, a reciprocating drill blank holder mounted on a pivoted saddle, the saddle pivoted on the bed, a laterally movable taper slide pivotally supported on the saddle and having a beveled surface in engagementwith the slide supporting thecutter spindle, means for imparting a lateral swinging movement to the drill holding spindle, and

means for reciprocating the holder, all sub- 5 stantially as described.

5. In combination in a machine for grooving drills, a frame or bed, a cutter spindle borne on a movable slide, a reciprocating drill blank holder mounted on a pivoted saddle, the saddle pivoted on the bed, a laterally movable taper slide pivotally supported on the saddle and having a beveled surface in en- 1 gagement with the slide supporting the cutter spindle, a lip on one of said parts engaging a groove in the opposite part, means for impart ing a lateral swinging movement to the drill holding spindle, and means for reciprocating the holder, all substantially as described.

6. In combination with the reciprocatingand pivoted drill holder of a machine for grooving drills, a taper slide supported in operative relation to the holder, the bushing in sliding engagement with the taper slide, the pivot in engagement with the bushing, the

beveled surface on the taper slide, the groove saddle, and a cutter spindle mounted in operative relation to the drill blank holder, all substantially as described.

S. In combination in a machine for grooving drillsa frame or bed, a reciprocating drill blank holder supported on a swinging saddle, means for reciprocating the holder, the gear rotarily mounted on the holder, the clutch (le vice secured to the holder, means for automatically engaging the gear and clutch device, the saddle pivoted on the bed, means for imparting a lateral swinging movement to the saddle, and a cutter spindle mounted in operative relation to the drill blank holder, all substantially as described.

9. In combination in a machine for grooving drills, a frame or bed, a drill holding spindle mounted on a reciprocating drill slide, a gear rotarily mounted on the spindle, a clutch device for securing the gear to the spindle, the slide supported on a swinging saddle, a feed-worm mounted on the saddle and in engagement with the drill slide to reciprocate it,

jthe saddle pivoted to the bed, means for imparting a lateral swinging movement to the saddle, means for rotating the drill spindle,

means for rotating the feed screw, and a cutter spindle supported in operative relation to the drill holding spindle, all substantially as described.

10. In combination in a machine for grooving drills, a frame or bed,a reciprocating drill holder supported on a saddle, the saddle pivoted to the bed, a worm supported on the sadf dle and meshing with a stationary worm gear, means for rotating the worm, and a cutter spindle supported in operative relation to the drill holder, all substantially as described.

11. In combination in a machine for groov ing drills, a frame or bed, a drill holder supported on a saddle, the saddle pivoted to the bed, a worm shaft supported on the saddle 1 and meshing with a stationary worm gear, a

bevel gear shaft connected to the worm shaft,

clutch mechanism connecting said shafts, means for rotating the bevel gear shaft, a cutter spindle supported in operative relation to the drill holder, and means for changing the relative position of the cutter spindle and drill 'holder in a plane parallel to the axis of the j latter, all substantially as described.

12. In combination in a machine for groov- 1 ing drills, a frame or bed, a drill holder supported on a swinging saddle, the saddle pivoted to the bed, a worm shaft supported on the saddle and meshing with a stationary Worm :gear, a worm rotarily mounted on a bevel gear shaft and meshing with the worm shaft, clutch mechanism secured to the bevel gear j shaft and adapted to connect the two shafts last mentioned, an automatic clutch operating device, means for rotating the bevel gear shaft, a cutter spindle supported in operative relation to the drill holder, and means for changing the relative position of the cutter ing drills, a drill holder supported on a recip rocating drill slide, the drill slide supported on a swinging saddle, a worm shaft mounted on the swinging saddle and in engagement with a stationary gear, a bevel gear shaft in engagement with said worm shaft, the bevel gear shaft in engagement with the drill holder, the feed screw mounted on the saddle and in engagement with the drill slide, and bevel gear shaft, a feed worm shaft in mesh with the drill slide feed screw, and a cutter spindle mounted in operative relation to the drill holder, all substantially as described.

14. In combination in a machine for grooving drills, a drill holder supported on a reciprocating drill slide, the drill slide supported on a swinging saddle, a worm shaft mounted on the swinging saddle and in engagement with a stationary gear, a bevel gear shaft in engagement with said worm shaft, the bevel gear shaft in engagement with the drill holder, the feed screw mounted on the saddle and in engagement with the drill slide and bevel gear shaft, a feed worm shaft in mesh with the drill slide feed screw and borne on a swinging feed swivel box, the feed swivel box, a device for holding the drill slide feed screw and feed worm shaft in engagement, the automatic releasing device, and a cutter spindle'mounted in operative relation to the drill holding spindle, all substantially as described.

15. In combination with the reciprocating drill holder of a machine for grooving drills, a base, an adjustable drill guide slide located on the base, and a separable drill guide supported on the slide,and means for moving the sections of said drill guide toward and from each other by the reciprocation of the slide, all substantially as described.

16. In combination with the reciprocating drill holder of a machine for grooving drills, a base, an adjustable guide slide located on the base, the adjusting screw connected to the base and slide, diagonal grooves located in the slide,separable drill guides located on the slide and having tongues resting in the grooves,

and means for preventing the longitudinal Witnesses:

B. A. HOUGH,

ANSON W. BUROHARD. 

